<template>
  <view class="uni-data-pickerview">
    <scroll-view v-if="!isCloudDataList" class="selected-area" scroll-x="true">
      <view class="selected-list">
        <view
          class="selected-item"
          v-for="(item, index) in selected"
          :key="index"
          :class="{
            'selected-item-active': index == selectedIndex,
          }"
          @click="handleSelect(index)"
        >
          <text>{{ item.text || "" }}</text>
        </view>
      </view>
    </scroll-view>
    <view class="tab-c">
      <scroll-view class="list" :scroll-y="true">
        <view class="item" :class="{ 'is-disabled': !!item.disable }" v-for="(item, j) in dataList[selectedIndex]" :key="j" @click="handleNodeClick(item, selectedIndex, j)">
          <text class="item-text">{{ item[map.text] }}</text>
          <view class="check" v-if="selected.length > selectedIndex && item[map.value] == selected[selectedIndex].value"></view>
        </view>
      </scroll-view>

      <view class="loading-cover" v-if="loading">
        <uni-load-more class="load-more" :contentText="loadMore" status="loading"></uni-load-more>
      </view>
      <view class="error-message" v-if="errorMessage">
        <text class="error-text">{{ errorMessage }}</text>
      </view>
    </view>
  </view>
</template>

<script lang="ts">
import dataPicker from "./uni-data-picker.js";

/**
 * DataPickerview
 * @description uni-data-pickerview
 * @tutorial https://ext.dcloud.net.cn/plugin?id=3796
 * @property {Array} localdata 本地数据，参考
 * @property {Boolean} step-searh = [true|false] 是否分布查询
 * @value true 启用分布查询，仅查询当前选中节点
 * @value false 关闭分布查询，一次查询出所有数据
 * @property {String|DBFieldString} self-field 分布查询当前字段名称
 * @property {String|DBFieldString} parent-field 分布查询父字段名称
 * @property {String|DBCollectionString} collection 表名
 * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
 * @property {String} orderby 排序字段及正序倒叙设置
 * @property {String|JQLString} where 查询条件
 */
export default {
  name: "UniDataPickerView",
  emits: ["nodeclick", "change", "datachange", "update:modelValue"],
  mixins: [dataPicker],
  props: {
    managedMode: {
      type: Boolean,
      default: false,
    },
    ellipsis: {
      type: Boolean,
      default: true,
    },
  },
  created() {
    if (!this.managedMode) {
      this.$nextTick(() => {
        this.loadData();
      });
    }
  },
  methods: {
    onPropsChange() {
      this._treeData = [];
      this.selectedIndex = 0;
      this.$nextTick(() => {
        this.loadData();
      });
    },
    handleSelect(index) {
      this.selectedIndex = index;
    },
    handleNodeClick(item, i, j) {
      if (item.disable) {
        return;
      }

      const node = this.dataList[i][j];
      const text = node[this.map.text];
      const value = node[this.map.value];

      if (i < this.selected.length - 1) {
        this.selected.splice(i, this.selected.length - i);
        this.selected.push({
          text,
          value,
        });
      } else if (i === this.selected.length - 1) {
        this.selected.splice(i, 1, {
          text,
          value,
        });
      }

      if (node.isleaf) {
        this.onSelectedChange(node, node.isleaf);
        return;
      }

      const { isleaf, hasNodes } = this._updateBindData();

      // 本地数据
      if (this.isLocalData) {
        this.onSelectedChange(node, !hasNodes || isleaf);
      } else if (this.isCloudDataList) {
        // Cloud 数据 (单列)
        this.onSelectedChange(node, true);
      } else if (this.isCloudDataTree) {
        // Cloud 数据 (树形)
        if (isleaf) {
          this.onSelectedChange(node, node.isleaf);
        } else if (!hasNodes) {
          // 请求一次服务器以确定是否为叶子节点
          this.loadCloudDataNode((data) => {
            if (!data.length) {
              node.isleaf = true;
            } else {
              this._treeData.push(...data);
              this._updateBindData(node);
            }
            this.onSelectedChange(node, node.isleaf);
          });
        }
      }
    },
    updateData(data) {
      this._treeData = data.treeData;
      this.selected = data.selected;
      if (!this._treeData.length) {
        this.loadData();
      } else {
        //this.selected = data.selected
        this._updateBindData();
      }
    },
    onDataChange() {
      this.$emit("datachange");
    },
    onSelectedChange(node, isleaf) {
      if (isleaf) {
        this._dispatchEvent();
      }

      if (node) {
        this.$emit("nodeclick", node);
      }
    },
    _dispatchEvent() {
      this.$emit("change", this.selected.slice(0));
    },
  },
};
</script>

<style lang="scss">
$uni-primary: #007aff !default;

.uni-data-pickerview {
  flex: 1;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: column;
  overflow: hidden;
  height: 100%;
}

.error-text {
  color: #dd524d;
}

.loading-cover {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.5);
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: column;
  align-items: center;
  z-index: 1001;
}

.load-more {
  /* #ifndef APP-NVUE */
  margin: auto;
  /* #endif */
}

.error-message {
  background-color: #fff;
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  padding: 15px;
  opacity: 0.9;
  z-index: 102;
}

/* #ifdef APP-NVUE */
.selected-area {
  width: 750rpx;
}
/* #endif */

.selected-list {
  /* #ifndef APP-NVUE */
  display: flex;
  flex-wrap: nowrap;
  /* #endif */
  flex-direction: row;
  padding: 0 5px;
  border-bottom: 1px solid #f8f8f8;
}

.selected-item {
  margin-left: 10px;
  margin-right: 10px;
  padding: 12px 0;
  text-align: center;
  /* #ifndef APP-NVUE */
  white-space: nowrap;
  /* #endif */
}

.selected-item-text-overflow {
  width: 168px;
  /* fix nvue */
  overflow: hidden;
  /* #ifndef APP-NVUE */
  width: 6em;
  white-space: nowrap;
  text-overflow: ellipsis;
  -o-text-overflow: ellipsis;
  /* #endif */
}

.selected-item-active {
  border-bottom: 2px solid $uni-primary;
}

.selected-item-text {
  color: $uni-primary;
}

.tab-c {
  position: relative;
  flex: 1;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  overflow: hidden;
}

.list {
  flex: 1;
}

.item {
  padding: 12px 15px;
  /* border-bottom: 1px solid #f0f0f0; */
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  justify-content: space-between;
}

.is-disabled {
  opacity: 0.5;
}

.item-text {
  /* flex: 1; */
  color: #333333;
}

.item-text-overflow {
  width: 280px;
  /* fix nvue */
  overflow: hidden;
  /* #ifndef APP-NVUE */
  width: 20em;
  white-space: nowrap;
  text-overflow: ellipsis;
  -o-text-overflow: ellipsis;
  /* #endif */
}

.check {
  margin-right: 5px;
  border: 2px solid $uni-primary;
  border-left: 0;
  border-top: 0;
  height: 12px;
  width: 6px;
  transform-origin: center;
  /* #ifndef APP-NVUE */
  transition: all 0.3s;
  /* #endif */
  transform: rotate(45deg);
}
</style>
